There cannot be a least common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the smallest of those common factors is the Least Common Factor.
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The lowest common factor of any set of positive integers is always going to be 1.
The factors of 135 are: 1, 3, 5, 9, 15, 27, 45, 135The factors of 165 are: 1, 3, 5, 11, 15, 33, 55, 165The common factors are: 1, 3, 5, 15The Greatest Common Factor: GCF = 15
The lowest common factor of any set of positive integers is 1.
The lowest common factor of any set of integers is 1.
The least common factor of any set of integers is 1.
The lowest common multiple of 11 and 5 is equal to 11 x 5 = 55